Question: Whose professional harpsichordist's namesake was the Goldberg Variations named after?
Paraphrase: Whose expert harpsichordist's namesake was the Goldberg Variations named after?
SPARQL (Wikidata): SELECT ?answer WHERE { wd:Q213728 wdt:P138 ?answer . ?answer wdt:P106 wd:Q5371902}
Answer: Johann Gottlieb Goldberg